IpAnonymizationUtility.php

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<?php
namespace TYPO3\CMS\Core\Utility;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class IpAnonymizationUtility
{

    public static $MASKV4 = [
        1 => '255.255.255.0',
        2 => '255.255.0.0'
    ];

    public static $MASKV6 = [
        1 => 'ffff:ffff:ffff:ffff:0000:0000:0000:0000',
        2 => 'ffff:ffff:ffff:0000:0000:0000:0000:0000',
    ];

    public static function anonymizeIp($address, $mask = null)
    {
        if ($mask === null) {
            $mask = (int)$GLOBALS['TYPO3_CONF_VARS']['SYS']['ipAnonymization'];
        }
        if ($mask < 0 || $mask > 2) {
            throw new \UnexpectedValueException(sprintf('The provided value "%d" is not an allowed value for the IP mask.', $mask), 1519739203);
        }
        if ($mask === 0) {
            return $address;
        }
        if (empty($address)) {
            return '';
        }

        $packedAddress = inet_pton($address);
        $length = strlen($packedAddress);

        if ($length === 4) {
            $bitMask = self::$MASKV4[$mask];
        } elseif ($length === 16) {
            $bitMask = self::$MASKV6[$mask];
        } else {
            return '';
        }
        return inet_ntop($packedAddress & inet_pton($bitMask));
    }
}